This is a terraformed planet which is the fifth one around the star Eta Tiessus. Since it is much less volcanically active it lacks Earth’s plate tectonics. Instead there are 17 weakness zones in the crust where volcanic mountains have formed. In addition, there is a highland in the northern hemisphere the size of a continent. It is unclear how it has formed. But there is probably a connection to the large, low area in the southern hemisphere. It nowadays constitutes the planet’s largest sea. Siminatessa’s axial tilt is 30 degrees which gives large seasonal differences. The seasons are to some degrees evened out by the strong greenhouse effect. However, the differences are still rather large.

The entire planet is a colony of Santovasku. Apart from Santovaskians there are minorities descending from Di Weld, Lamark and Pejora. These have lived there for so long that an independence movement has formed. It is named the Alliance for Siminatessa’s Independence.